No joy, they won't sell clips....the search continues!
Having said I wouldn't be surprised if they sell them, I am not surprised that they don't. That is probably the hardest part for any counterfeiter to make.
With this kind of thing there are two things that can help a serach:
Knowing the correct yterminology for the part
Knowing what other use it might have. It could be in the construction industry, camping equipment, car parts, hunting...